This issue only needs to be tested in 1 OS. Install the choicegroup plugin in a Moodle 3.5 or higher. Create a new choice group in a course. In the app, login as a student, open the choice group and check that the plugin is supported in the app. In web as admin, go to Site administration > Mobile app > Mobile features and select "Group choice" in the list of disabled features. Save the changes. In the app, do a logout/login (or restart the app) and open the choice group again. Check that the activity is no longer supported.